人教版五年级上册分宜县凤阳中心学校 敖霞梅复习简便复习简便运算运算=1250.81.3 =(1250.8)1.3 =100 1.3 =1301251.30.8 =0.251.20.9 =0.25(40.3)0.9 =(0.254)0.30.9 =10.30.9 =0.270.250.91.2=(200-1)0.88=2000.88-10.88=176-0.88 =175.121990.889010.3= 90 （10+0.3）=9010+900.3=900+27=9272.3715-2.375=2.37（15-5）=2.3710=23.79.79.799= 9.71+9.799=9.7（1+99）=9.7100=97010.96+1090.4=1090.6+1090.4=109（0.6+0.4）=1091=10950.52.50.2=50.5（2.50.2）=50.55=10.1括号前面是除号，去掉括号要变号，乘号变除号，除号变乘号2.4（3.65）=2.43.65=2.453.6=123.6=214.68-7.82-2.18=14.68-（7.82+2.18）=14.68-10=4.
